I preordered my 6s through the Apple site on 09/12. (The closest Apple Store is 175 miles away.) Now that i've received my 6s, Im curious how I go about giving AT&T my old my phone. I called AT&T two days ago and the rep got with the manager, which they came to the conclusion I would put my old phone in the iPhone box, and there would a be a return label back to AT&T. There was nothing like this in the box. Any clue?